Abstract In order to predict the field ionization probabilities, the accurate ab initio electrostatic potential of molecules has to be calculated. However, the calculation of the full ab initio electrostatic potential of molecules is complicated, even impossible for some larger molecules with low symmetry. Here, we present a semi-empirical model to treat the field ionization of molecules in an intense laser field. In this model, a modified Coulomb potential is used to take the place of the complicated ab initio electrostatic potential of molecules. The analytic equations of the Keldysh adiabatic parameter using the Coulomb potential and the modified Coulomb potential have first been given. Using our semi-empirical model, we have calculated the field ionization probabilities and the Keldysh adiabatic parameters of O2, N2, SO2, C2H4, CH3CN and C6H6 in an intense laser field. The results agree excellently with the calculations using the ab initio electrostatic potential of molecules. As the modified parameter for the Coulomb potential can be found from experimental measurements, the field ionization mechanism of molecules can be immediately predicted with our semi-empirical model.
Received: 09 April 2001
Revised: 24 April 2001
Accepted manuscript online:
PACS:
33.80.Eh
(Autoionization, photoionization, and photodetachment)
Fund: Project supported by the Special Foundation for State Major Basic Research Program of China (Grant No. G1999075207), the National Natural Science Foundation of China (Grant Nos. 19884001 and 19525412), and the China Postdoctoral Science Foundation.
Cite this article:
Wu Cheng-yin (吴成印), Gong Qi-huang (龚旗煌) FIELD IONIZATION OF MOLECULES IN AN INTENSE LASER FIELD 2001 Chinese Physics 10 814
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